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使用Cookie记住用户名和密码

<form name = "f1" method="get" action="servlet/LoginServlet">
    <table>
        <tr>
            <td>Username:</td>
            <td><input type="text" name="username" value="${un}"></td>
        </tr>
        <tr>
            <td>Password:</td>
            <td><input type="password" name = "password" value="${pw}"></td>
        </tr>
        <tr>
            <td>AutoLogin:</td>
            <td><input type="checkbox" name = "auto" value = "1"></td>
        </tr>    
        <tr>
            <td colspan="2" align="center"><input type="submit" value="Login"> </td>
        </tr>
    </table>
    
    </form>

PrepareLogin

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Cookie[] cs = request.getCookies();
        
        
        if(cs!=null && cs.length>0){
            for(int i = 0 ; i < cs.length ; i++){
                Cookie c = cs[i];
                System.out.println(cs.length);
                System.out.println(i+"--"+cs[i].getName());
                if(c.getName().equals("username")){                    
                    String value = c.getValue();
                    request.setAttribute("un", value);
                    System.out.println(value);
                }
                if(c.getName().equals("password")){
                    String value = c.getValue() ;
                    request.setAttribute("pw", value);　　　　//将值传递给jsp页面
                    System.out.println(value);
                }
            }
        }
        
        request.getRequestDispatcher("/login.jsp").forward(request, response);
    }

保存Cookie

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        
        String auto = request.getParameter("auto");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        if(auto != null && auto.equals("1")){
            Cookie u = new Cookie("username", username);
            Cookie p = new Cookie("password",password);
            
            u.setMaxAge(60*60);
            p.setMaxAge(60*60);
            
            response.addCookie(u);
            response.addCookie(p);
        }
        
        PrintWriter w = response.getWriter();
        w.println("<html>"+
                "Hello"+
                "</html>"
                );
        w.flush();
        w.close();
    }

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原文地址：https://www.cnblogs.com/da-peng/p/5761772.html